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Realm vs Nginx: catalog facts
Realm	Nginx
Free Free and open source under the MIT licence.	Free Nginx open source is free. Nginx Plus is a paid subscription.
Windows, Linux, Self-hosted, Command line	Windows, macOS, Linux, Self-hosted
Starts a relay with a single command Concurrent bidirectional forwarding	Event-driven model handles large numbers of idle connections cheaply One binary covers static serving, reverse proxying, caching and load balancing
Command-line only, with no graphical interface Documentation is mostly in the repository readme	Dynamic modules must usually be compiled in Several load-balancing and monitoring features are exclusive to the paid Nginx Plus
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: BSD-2-Clause
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.